Think about it in terms of units of energy expended and units of mass retained. It will grow as much as it can. The larger number of small leaves that are retained will produce the same amount of growth as the lesser number of larger leaves that the plant would have if you didn't head it back, pinch-by-pinch. It will grow as much leaf surface as programed for a given cycle by either leafing out with big leaves or little leaves. What you don't cut off is retained. By trimming off a smaller mass, you will get compound growth, just like compound interest builds up over time. Adam Smith was really a closet bonsaiist and extrapolated his economic theories from his experiences growing JBP. (Not many people know this, but I have it on good authority.)